minor fix to trial signup workflow

minor fixes with Google Translate and Youdao

support for Anki 25.07

Added Youdao TTS service, fixed Duden service umlaut handling, other small fixes

fix minor install glitch

bug fixes and improvements to trial workflow

OpenAI gpt-4o-mini-tts model with instruction, minor bug fixes

fix startup bug

improve trial registration workflow

fix naver papago